Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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Compute the number of kilograms of hydrogen that pass per hour through a 5-mm-thick sheet of palladium having an area of 0.20 m² at 500°C. Assume a diffusion coefficient of 1.0 × 10-³m²/s and that the concentrations at the high and low pressure sides of the plate are 2.4 and 0.6 kg of hydrogen per m³ of palladium. Assume steady state conditions. dy CO4 38 )L
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- Question-3. A piece of titanium (Ti) sheet in a thickness of 5 mm was exposed to a nitrogen-rich gas atmosphere on one side and a nitrogen-deficient atmosphere on the other side at 850 °C. After having reached steady-state, the metal sheet was quickly cooled to room temperature. The nitrogen concentrations at the two surfaces were determined to be 0.02 and 0.0018 wt%. The densities for nitrogen (N) and Ti are 0.808 g/cm³ and 4.5 g/cm³, respectively. Answer the following questions: (a) Convert the nitrogen concentrations from weight percent to kilograms per meter cubed. (b) Compute the diffusion coefficient if the diffusion flux is 2.58 × 10-6 kg/m²-s.arrow_forward28.21 A 1 x 10-2 m spherical pellet is sprayed with a very thin coat of paint. The paint contains a volatile solvent. To dry the pellet, a 300 K and 1.013 × 105 Pa air stream flows around it with a bulk velocity of 1 m/s. The estimated loading of the solvent in the wet paint is 0.12 g solvent/cm³. Physical properties are vapor pressure of the solvent = 1.27 x 104 Pa mass diffusivity of solvent in air = 9.62 x 10-6 m²/s kinematic viscosity of air density of air = 1.569 x 10-5 m²/s = 1.177 kg/m³ thermal conductivity of air thermal diffusivity of air heat capacity of air = 2.624 x 10-2 J/m.s. K = 2.216 x 10-5 m²/s = 1.006 J/g. K = 78 g/g mole molecular weight of the solvent Use the McAdam's¹¹ equation Nu = 0.37(Redp) 0.6 (Pr) 1/3, where Redp dp vx V to evaluate (a) the heat-transfer coefficient, h; (b) the mass-transfer coefficient, ke; (c) the molar flux of the solvent into the air stream.arrow_forwardb) There are many examples of chemical equilibrium all around you. One example is a bottle of fizzy cooldrink. In the bottle there is carbon dioxide (CO2) dissolved in the liquid. There is also CO2 gas in the space between the liquid and the cap. There is a constant movement of CO2 from the liquid to the gas phase, and from the gas phase into the liquid. However, if you look at the bottle there does not appear to be any change. The system is in equilibrium. Write the equilibrium reaction for this event: +arrow_forward
- calculate the boiling point of a solution of 400.0 g of ethylene glycol dissolved in 400 g of waterarrow_forwardA spherical mothball initially with radius, Ro, is shrinking in volume due to the sublimation of naphthalene through the air in a large room. At room temperature (T) and pressure (PT), the naphthalene (with molecular weight as MWa) in the mothball exerts a vapor pressure (VPa). It is of interest to investigate the rate at which the mothball is shrinking due to the diffusion of naphthalene in an air-rich environment. A. Illustrate the physical model/s that can describe the diffusion of naphthalene through the air-rich environment (room). Indicate the control volume/s (differential volume/s) as an expression of the transfer area and distance. Specify the components needed in establishing the shell balance. Indicate the boundary conditions and illustrate the direction of transfer in each physical model. Note: Express the radial distance from the mothball surface as r, while the shrinking radius of the mothball is expressed as R. Use and define subscripts, as necessary. B. For each…arrow_forwardA steel sheet is exposed to a nitrogen rich atmosphere at 900°C and achieves steady-state diffusion. The diffusion coefficient for nitrogen at this temperature is 1.85 x 10-10 m2 kg and the diffusion flux is 1.0 x 10-7 If the initial concentration of sec m².sec kg nitrogen in the steel at the high-pressure surface is 2 at what distance into the sheet m39 will the concentration of nitrogen be 0.5 *9? m3 4 360 words D Focus 255% e Type here to search IA 5:02 PM W 2/24/2022 10 165HZ V WQHD |. ROG ZEPHYRUS 100% DCI-P3 PANTONE Validated F5 F9 F10 ESC AURA DELETE %24 & %3D P www ENT G Karrow_forward
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